Originally Posted by DotJun
Water heater, clothes dryer, portable room heaters, hair dryers, dishwasher. These are the highest energy hogs in a typical house. Outside would be compressors and pool pumps.
Just don't forget about the wire gauge. I've seen so many shady backyard box renovations with big breakers and tiny wires.
In my country running 240V, most household items don't require more than 15A sockets, and my Clothes Dryer plugs into a regular 13A socket. (regular house dryers are about 2400 watts or so).
The only thing that requires 20A are airconds, water heater, and maybe some stoves with more power requirements.
I have yet to see anything requiring 50A in a typical household.
Maybe in the US, with 110V you might need to double the amperage for typical household items. For instance, you'll need 30A for a 3000 watt dryer.... not sure what sort of dryer uses 50A (must be industrial strength or those they put in apartments.)